On Mon, 04 Mar 2019 04:44:01 GMT, Shay
m wrote:

replying to Danny D., Shay wrote:
Just for info. If you touch a main drain or swim around it, you wont feel
the water flowing nor suction. Reason being is because the covers are
anti-vortex. But aside from that, main drains are not like a bathtub where it
sucks in water forcefully. They pull in particals from the water, not just
water. And if you have a hot tub/Spa, you might see leaves or other debris in
the spa getting sucked toward the drains. This is because the drains In a spa
are stronger and the jets in the spa circulate the debris. And a main drain
isnt actually a drain, its a housing pipe, suction outlet that goes back
to the pump. Just wanted to put that out there.

The best (safest) way to tell is with a stick of PVC pipe. Pour some
water in the top with a little food color in it with the pipe a foot
or 2 from the drain. If the drain is working the color will be sucked
in. If it just pools around, the drain is not working.